Use streams during CSV import

[vincius0000]

Now during CSV import a whole CSV document is loaded in memory. It should be changed to take in a batch or single line and that can be achieved by using streams.

This is to keep strain away from mobile devices on large CSV files (if there were to be any).

[enrique-lozano]

At the moment the app is just starting and I don't think many users use this feature. Still, I think what you say makes a lot of sense and we should keep an eye on it.

The truth is that I haven't tested the performance with a very large CSV, I have no idea how bad it will be. I will do tests in the future if I don't have more information on this aspect and the app continues to grow.